[root@localhost ~]# virtualenv -p /usr/local/bin/python3.5 py3

Running virtualenv with interpreter /usr/local/bin/python3.5

Traceback (most recent call last):

  File "/usr/lib/python2.7/site-packages/enum/__init__.py", line 371, in __getattr__

    return cls._member_map_[name]

KeyError: '_convert'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/usr/lib/python2.7/site-packages/virtualenv.py", line 23, in <module>

    import subprocess

  File "/usr/local/lib/python3.5/subprocess.py", line 50, in <module>

    import signal

  File "/usr/local/lib/python3.5/signal.py", line 8, in <module>

    _IntEnum._convert(

  File "/usr/lib/python2.7/site-packages/enum/__init__.py", line 373, in __getattr__

    raise AttributeError(name)

AttributeError: _convert